`<ptfkit/cosby1984.h>`¶

#include <ptfkit/cosby1984.h>

Cosby et al. (1984), United States.

Source¶

Cosby, B. J., Hornberger, G. M., Clapp, R. B., & Ginn, T. R. (1984). A statistical exploration of the relationships of soil moisture characteristics to the physical properties of soils. Water Resources Research, 20(6), 682-690.

Scope¶

Territory: United States

Dataset: 1448 soil samples from Holtan et al. (1968) and Rawls et al. (1976).

PTF catalog page

`cosby1984_univariate_ptf_result`¶

typedef struct {
    double mean_b;
    double mean_log_psi_s;
    double mean_log_k_sat;
    double mean_theta_s;
    double sd_b;
    double sd_log_k_sat;
    double sd_theta_s;
 } cosby1984_univariate_ptf_result;

Field	Description
`mean_b`	Mean slope of the moisture characteristic. (dimensionless)
`mean_log_psi_s`	Mean log saturation matric potential; the underlying potential is expressed in cm H2O. (reported log value)
`mean_log_k_sat`	Mean log saturated hydraulic conductivity; the underlying conductivity is expressed in inches per hour. (reported log value)
`mean_theta_s`	Mean saturated water content. (% volume/volume)
`sd_b`	Standard deviation of b. (dimensionless)
`sd_log_k_sat`	Standard deviation of log saturated hydraulic conductivity. (reported log value)
`sd_theta_s`	Standard deviation of saturated water content. (% volume/volume)

Functions¶

`calc_ptf_cosby1984_univariate`¶

Estimate Cosby et al. (1984) univariate hydraulic parameter statistics from soil texture.

static inline cosby1984_univariate_ptf_result calc_ptf_cosby1984_univariate(double sand, double silt, double clay);

Parameters¶

Name	Direction	Description
`sand`	in	Sand content. (%)
`silt`	in	Silt content. (%)
`clay`	in	Clay content. (%)

Returns¶

A cosby1984_univariate_ptf_result value.

Note

No back-transform is applied to logarithmic outputs.

Note

Public API names are provisional for pilot testing.

Warning

Log-transformed output units use the pilot contract `reported log value`.

<ptfkit/cosby1984.h>¶